References and Bibliography
Hyperlinks
- American Conifer Society.
- The Conifer Conservation Program, Royal Botanic Garden Edinburgh.
- The Model Forest Program Canadian Forest Service.
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The JC Raulston Arboretum , North Carolina State University.
- Botanic Gardens University of Delaware.
- Urban Forestry Michigan State University Extension Database.
- Oregon's Heritage Trees
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The Families of Flowering plants: Descriptions, Illustrations, Identification, and Information Retrieval , Watson, L., and Dallwitz, M.J.
- Many Botany Links, Oberon University.
Books
- Identification Guide to the Trees of Canada, Jean Lauriault, Fitzhenry & Whiteside, 1989.
- The Plant Book, D.J. Mabberley, Cambridge University Press, 1987.
- The Audubon Society Field Guide to North American Trees, Alfred A. Knopf, Inc., 1980.
- Forest Trees of the United States and Canada, and How to Identify
Them, Elbert L. Little,Jr., Dover Publications Inc.,1979.
- The Botanical World, D.K. Northington and J.R.Goodin, Times Mirror/Mosby College Publishing, 1984.
- Trees of North America and Europe, Roger Phillips, Random House, 1978.
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